Internal-combustion engine



1927' E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed Oct. 23, 1924 2She ets-Sheet 1 l I. I

5. A5. 50/8 r/vrr'.

April 5 1927.

E. R. BNURTNETT INTERNAL COMBUSTION ENGINE Filed loot. 23. 1924 I 2Sheets-Sheet 2 Patented Apr. 5, 1927.

EVERETT BURTN'ETT, OF LOS ANGELES, CALIFORNIA, ASSIGNOR, BY DIRECT ANDMESNE ASSIGNMENTS, TO THE AUTOMOTIVE VALVES 00., OF LOS ANGELESf'CALI-FORNIA, A. VOLUNTARY TRUST.

rnrnnnaL-connusrron ENGINE.

Application filed October 23, 1924. Serial No. 745,341.

My invention relates generally to internal combustion enginesthatoperate on the two stroke cycle principle, and moreparticularly to avalve structurethat is particularly designed for a two stroke cycleinternal combustion engine having; gaseous fuel pumptive piston valvecylinders will be as short as possible in order to eliminatecondensation of the fuel mixture; further to provide a piston valvestructure that will be arranged I immediately adjacent and directlyconnected to the driving mechanism and the piston valve actuating shafthaving an extension on the opposite end to the end to which the drivingmechanism'is connected, for the arrangement of the generator connection,thus making it possible .to readily remove the generator withoutinterfering with the piston valve timing in relation to theengine shaft.With the foregoing and other objects in view, my invention consists. 'inthe novel features of construction and arrangement of parts which willbe hereinafter described and claimed, reference being had to theaccompanying drawings, in which 7 Fig. 1 is top planview of an internalcombustion engineconstructed in accordance with myinvention.

Fig. 2 is a vertical section taken approximately .on the line 22 ofFig. 1. 3 Fig. 3 is an enlarged vertlcal -transverse section taken onthe line 3-3 of Fig. 2.

Referring by numeralsto the accompanying drawings which illustrate apractical embodiment of ,my invention, designates-a cylinder block inwhich are formed four combust-ion chambers 11, v12', 13 and :14 and apair'of pumping chambers 15 and 16. These chambers are disposedin a row,with their axes parallel, and the four combustion chambers are arrangedin pairs, with the, head ends of chambers ll and 12 connected by acommon clearance space and the head ends of chambers 13 and 14 connectedbya common clearance space. Gaseous fuel from pumping chamber 15 passesthrough an eX- ternally arranged transfer duct 17 to inlet ports leadingmto the combustion chamber 12 of the connected pair of combustion cham-'bers 11 and 12, and gaseous fuel is pumped I froinchamber 16 through atransfer duct 18 to combustion chamber 14 of the pair-of con-. nectedcombustion chambers 13 and 14.

Suitable pistons are arranged for operation within all of the combustionand pumping chambers, saidflpistons being suitably connected to thecranksor throws of; a crank shaft .19, and the latter'being mounted forrotation in suitable bearings that are formed at-the ends, and withinacrank case 20,

which latter is disposedbelow and connected to block 10. -Formedintegralwith the side of block 10 and lmmediately adjacent tothe pumpingcylinders 15 and16 is a piston valve chamber block 20, and formedtherein are pischamber 15 and valve chamber 22 is in transversealinement with pumping chamber 16.

ton valve chambers 21 and 22. Valve chamber 1 A head block 23 is securedin-position on w I ,top of cylinder block 10 andv closes the. com,-'bustion and pumping chambers therein and extending laterally from thesides of this .blockatone end is an extension 24 that serves as a headblock for the pistonvalve cylinder block 20. The head or inner end ofvalve chamber 21 is connected to tlie'head or inner end of pumpingchamber 15 by a transversely disposed clearance space 25 that is formedin the under sideof block 24 and:

its extension 24 and a corresponding duct or clearance space'26. that isformedin the under sideiof block 23 and extension- 24 connects the heador upper end of pumping chamber 16 with the corresponding end of valvechamber 22. i i

Formedin the .wall of block 20 around the upperportions of the valvechambers 21 and 22 therein are connected annular chambers 27, andleading to said chambers-are gaseous fuel. inlet ports, such as 28, thatmaybe connected to'a suitable source of gaseous fuel supply, forinstance, a carburetor.

Leadingfrom the annular chamber 27 that surrounds pumping chamber 21into the upper portion of said pumping chamber are 7 A gaseous" fuelinlet ports 29 and corresponding inlet ports 30 lead from the annularchamber 27 that surrounds chamber 22 into v the upper portion of saidlast mentioned chamberQ Arranged for reciprocatory movement within valvechambers 2l'and 22 are respectively piston valves 31 and 32,

and connecting said pistons to the cranks or throws 33 of a val've crank3t =are 'connectlng rods such as 35.

Crank shaft 34 iisjonrnale-d for rotation in suitable bearings 36 thatare arranged beneath time i 20, and

this valve crankshaft is' d-r iven in any sui table manner, preferablyby means of a tram oigearinggsuch as 3 directly from crank Y shaftzta ofthe engine, said gearing or driva ting means being arranged so that saidvalve crank shaft 34 operates-at the same "speed as said crank shaft 19.a v

" Block '20 provides a lateral extension at i oneend of the enginecylinder block 1%), and

for convenience and in order to produce a compact-structure thegenerator 38 that is "associated with the engine s mounted on a suitablesupport 39 directly behind I the generator is positioned so that it maybe lower portion of blo c k 20, and thus said driven d i rectly from thepiston valve actuating crank shaft 34. The generator sha ft is directlyconnected. -to the piston valve crank shaft 34 in any suitable manner,but

preferably by a flexible tubular connection,

7 such as 40. Associated with the generator is an ordinary timingapparatus 41, and-connecting said timer with spar-k plugs-42 thatfare-located in head '23 above combustion It will be understood thatpistons 31 and 27through inlet ports-29 and 30 into the piston chambers21 and 22, for wheneit'her 1 crank 33 is at top center the piston valveconnected thereto is at the upper end of its the last mentionedcharnbersthe gaseous fuel stroke, thereby closing the corresponding in letvalves' and' when either crankis at low center the connected pistonvalve is at the lower end of its strike, thereby uncover-mg and openingthe corresponding gaseous fuel inlet valves. The gaseous *fuel chargesadmitted to'fithe piston -va-lve chambers2 l and 22 while the ports 29and 30 are open pass through ducts or clearance spaces 25 and 26 intopumpi'ngeha-mbers and 16, an'd from charges are pumped -throug h thetransfer ducts 17 and 18 to the =conibustio'n chambers 12 :and 14,respectively. I

"Inasmuch as the piston valve crank shaft 34 operates at 'engine speedor at the same speed with crankshatt19, the piston valves "Bljand32will-beaetuated in proper time provides a convenient arrangement wherebythe generator may be located in the space or \oliset immediately behindthe piston valve block and, as a result, a very compact structure isproduced and the generator and timer are located Where they are readilyaccessible for inspection, adjustment or repairs. That vportion ofpiston valve cylinder block that extends downwardly to provide a crankcase or housingfor the piston valve operatin-g'crank shaft 3% is open atits lower end, and said lower end communicates directly with the upperportion of crank case 120, and as a result the oil throw from thepumping piston connecting rods will splash upwardly into the pistonvalve anechanism, thereby efiectively lubricating the -same.- v

JO'bviously, the construction of the engine as herein shown anddescribed may be changed :and modified "in certain details withoutdeparting from the spirit of my inventiomthe scope of which is set forthin the appended claims.

Iclann as my inventlon:

' v1. The combination in a two stroke cycleinternal combustion engine,of a series of six cylinders arrangedin a row, two of the'cylinders atone end of the'row functioning as pumping cyl nders, the other fourcylinders lfunctlonmg as cornbustlon cylinders and being arranged 1npalrs with the :head ends of the members of each pair connected 'by acommon clearance, compression and combastion space, piston valvecylinders arranged laterally with relation to said pump ing cylinders,piston valves arranged for operation within Said. piston valve cylindersfor controlling the admission of :gaseous fuel into said piston valvecylinders, a piston vailve crank shaft, means connected to one- 'end ofsaid sh'a iit tordriv-ing same at engine crank shaft speed, the otherend of said shaft being extended to provide a point of attachment for anengine accessory, and the lower portions of the piston valve cylindersbeingin directcommunication with theinte'r'ior of the engine crank case,whereby the piston valves and their operating mechanism are lubricatedatrom the oil splash" within said crank case.

2. The combination, in a two stroke cycle internal combustion engine, ofa series of sixzcylin'ders arranged in a row, two of the cylinders atone end of the row functioning as pumping cylinders, the other fourcylinders functioning as combustion cylinders,

and being arranged in pairs with the head "ends of the members of eachpair connected by a common clearance, compression and combustion space,a transfer duct leading from the first pumping cylinder at the end ofthe row to the third cylinder in the row, which latter cylinder, withthe fourth cylinder in the row constitutes the first pair of combustioncylinders in the row from the end in which the pumpingcylinders arelocated, a transfer duct leading from the second pumping cylinder fromthe end of the row of cylinders, to the fifth cylinderin the row, whichlatter cylinder with the sixth cylinder in the row, constitutes thesecond pair of combustion cylinders in the row from the end in which thepair of pumping cylinders are located, piston valve cylinders arrangedwith relation to'said pumping cylinders, piston valves arranged foroperation within said piston valve cylinders for coni trolling theadmission of gaseous fuel into shaft speed, the other end of said shaftbeing extended to provide a pointof attachment 7 for an engineaccessory, and the lower portions of the piston valve cylinders being'indirect communication with the interior of the engine crank case, wherebythe, piston valves and their operating mechanism are lubricated from theoil splash within said crank case. r

In testimony whereof I affix my signature;

EVERETT R. BURTNETT.

